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Science 24 August 1984:
Vol. 225. no. 4664, pp. 830 - 833
DOI: 10.1126/science.225.4664.830
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Articles

Ionospheric Sporadic-E Parameters: Long-Term Trends

W. J. BAGGALEY 1

1 Department of Physics, University of Canterbury, Christchurch, New Zealand

The results of observations over 3frac12 solar cycles of ionosonde parameters describing sporadic-E patches (Es) are given for two Southern Hemisphere stations. Analysis has revealed systematic changes in the occurrence probabilities of foEs and fbEs, changes that are independent of time of day or season. It is unlikely that observational effects can be entirely responsible for the trends, which suggest that major long-term changes may be occurring at E region heights.

Submitted on March 2, 1984
Accepted on May 7, 1984

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Science. ISSN 0036-8075 (print), 1095-9203 (online)